Senior Systems Programmer – Legacy Systems
Teknita LLC —Downey, CA
- 7 years
- Computer Science
- System design
Senior Systems Programmer - Legacy Systems z/OS
Teknita LLC —Downey, CA
- 7 years
- System design
- Senior level
Systems Programmer/DBA- ADABAS/CICS/IMS
Teknita LLC —Downey, CA
- Hybrid work
- Computer Science
- Office
- 3 years
Senior Front End React Developer/Engineer
Glenair —Glendale, CA
- Full-time
- 5 years
- Senior level
Quick Apply
Senior Game Designer (Combat)
PlayStation Global —Santa Monica, CA
- $145,100 - $181,400 a year
- Hybrid work
- Computer Science
- 5 years
- Writing skills

More jobs to discover

Find similar jobs that you might be interested in.

Senior Systems Programmer - Legacy Systems z/OS
Teknita LLC —Downey, CA
Bachelor’s degree in Information Technology, Engineering, or related field. Evaluate new systems engineering technologies and assess their impact.
Senior Systems Programmer – Legacy Systems
Teknita LLC —Downey, CA
Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related field. Integrate hardware and software components across system…

I want to receive the latest job alert for senior systems programmer legacy in downey, ca

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Explore jobs in more locations

senior systems programmer legacy jobs near downey, ca

Front End Developer jobs in Glendale, CA

Senior Designer jobs in Santa Monica, CA

System Programmer jobs in New York, Ny

System Programmer jobs in North Richland Hills, Tx

Umc Health System jobs in Lubbock, Tx

System Programmer jobs in Columbia, Md

System Programmer jobs in California

Up Health System Bell jobs in Ishpeming, Mi

Entry Level Programmer jobs in Houston, Tx

System Programmer jobs in San Francisco, Ca

Nebraska Methodist Health System jobs in Fremont, Ne

System Programmer jobs in Houston, Tx

System Programmer jobs in Columbia, Sc

System Programmer jobs in Pennsylvania

System Programmer jobs in Chicago, Il

System Programmer jobs in Brownsville, Tx

Linux System Administrator jobs in Pittsburgh, Pa

Cnc Programmer jobs in Wichita, Ks

Computer Programmer jobs in Seattle, Wa

Front End Developer jobs in Fort Lauderdale, Fl

Senior Systems Programmer – Legacy Systems

Teknita LLC -
Downey, CA

Apply Now

Job Details

Qualifications

DB2
Systems architecture within technology
System performance optimization
System design
CICS
Assembly language
Computer hardware
Mainframe
Hardware support
Mentoring
Systems engineering
COBOL
Scripting
Mainframe development
Hardware management
IP networking
Capacity planning
System tuning
IT infrastructure planning

Full Job Description

Senior Systems Programmer – Legacy Systems

Job ID# 10TEK0852-031826 – Posted 03/18/2026 – Downey, CA

Key Responsibilities

We are seeking an experienced Senior Systems Programmer – Legacy Systems to support, maintain, and enhance enterprise z/OS mainframe environments. This role is responsible for both ongoing system maintenance and the development of operating system environments, ensuring optimal performance, security, and reliability.

The ideal candidate will bring deep expertise in mainframe technologies, strong leadership experience, and the ability to manage complex system upgrades and integrations with minimal downtime.

System Maintenance & Support

Plan and execute system upgrades in alignment with company-established schedules
Monitor and verify the health and performance of all z/OS systems
Analyze issues reported by development teams and provide recommendations and resolutions
Ensure compatibility between software applications and operating systems
Perform timely hardware upgrades with minimal disruption to operations
Apply patches and updates to security and system software regularly
Collaborate with stakeholders to test applications following system upgrades

Systems Development & Engineering

Analyze system requirements, risks, and cost considerations
Evaluate, select, and validate system software environments
Install and configure compilers, assemblers, and system utilities
Integrate hardware and software components across system environments
Monitor, fine-tune, and optimize system performance
Evaluate emerging technologies and assess their impact on the environment
Ensure security and information assurance policies are implemented and maintained

Required Skills:

Strong expertise in IBM mainframe technologies, including:
- z/OS, IMS, DB2, ADABAS
- SMP/E, JCL, IMS DB/DC, CICS
- ACF2 security, VTAM, TCP/IP, NetView
- Control-M, CA Spool
- Natural/SuperNatural, EntireX
- IMS & DB2 BMC Tools
- HMC, HOD, IODF, VTS
Proficiency in programming and scripting:
- Assembler, COBOL, REXX
Strong knowledge of system architecture, performance tuning, and capacity planning
Excellent troubleshooting and analytical skills
Ability to lead complex infrastructure initiatives and mentor junior staff
z/OS, HCD, z/OSMF
IBM z16 and z17 hardware platforms
CA ACF2 V17
Host On-Demand (HOD) V16.1

Experience Requirements

Minimum 7 years of experience in z/OS systems programming
At least 4 years in a lead or senior role managing complex mainframe environments

Education:

Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related field

Additional Information:

This is a systems programming role (not a development role)—mainframe developer resumes will not be considered
Candidate must have extensive hands-on experience with mainframe hardware and system software
Initial three (3) weeks onsite required
Ongoing onsite presence required for major system upgrades

Apply Now

Refine Your Search

senior systems programmer legacy jobs in downey, ca

Senior Systems Programmer – Legacy Systems

Senior Systems Programmer - Legacy Systems z/OS

Systems Programmer/DBA- ADABAS/CICS/IMS

Senior Front End React Developer/Engineer

Senior Game Designer (Combat)

More jobs to discover

I want to receive the latest job alert for senior systems programmer legacy in downey, ca

Explore jobs in more locations

Senior Systems Programmer – Legacy Systems

Key Responsibilities

System Maintenance & Support

Systems Development & Engineering

Required Skills:

Experience Requirements

Education:

Additional Information:

Job Seeker Tools

Employer Tools

Browse

Stay Connected